Identification and function analysis of two new gustatory receptors related to silkworm monophagy.

Silkworm is a typical monophagous insect that can only feed on fresh mulberry leaves. The mechanism for this monophagous nature is not fully understood. One bitter gustatory receptor (GR) GR66 located on the maxilla of the mouthpart has been reported to be an important factor influencing the feeding preference of silkworm.